Nope. Because is inside capsule, so the fish oil is protected. That's why a capsule fish oil can withstand high heat (until the capsule melt). For capsule, moisture is the enemy as it can cause it to stick together. Well Nordic claim theirs can withstand the heat of Middle East country. Their oil is stable for 3 years.

For liquid, as long as the bottle is not openend/does not contain air, should be no problem. That's why both Nordic and Carlson flush their bottle with Nitrogen with before sealing it. 

That's why for liquid, they mentioned keep refrigerated once opened and finished within 90 days. For capsule, no such conditions but I do that anyway. Keep it fresher.

Nordic have an additional rosemary extract which prolong the life of the oil along with vitamin E while carlson have only have vitamin E. Rosemary extract + vitamin E gives better longevity to fish oil compare to vitamin E alone.

To test whether the oil is OK or not, very simple. Bite into the oil. If you can vomit, it's bad. If you don't feel like vomitting, it's ok. So far for me, both Nordic and Carlson pass "the bite test"

That's why I always say, if money is no problem for you get Nordic. If money matters, get Carlson. Both of them are the best fish oil money can buy. Forget those Amway/Cosway/GNC fish oil. Concentration is low + high price + unproven quality (No IFOS certification)

Heat, oxygen and light are enemies to all oils (cooking oil, olive oil) except coconut oil. That's why when you are buying liquid oil,always make sure the bottle is opaque and not transparent. Refrigerate the bottle immediately upon opening.